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Finding the Fourth Proportional to 905.76, 1,359.12 and 690.64

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Solution

The fourth proportional to 905.76, 1,359.12 and 690.64 is: 1,036.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    905.76 : 1,359.12 = 690.64 : x
  2. Step 2: Convert to fraction form
    905.76/1,359.12 = 690.64/x
  3. Step 3: Cross multiply
    905.76x = 1,359.12 × 690.64
  4. Step 4: Simplify right side
    905.76x = 938,662.64
  5. Step 5: Solve for x
    x = 938,662.64/905.76
  6. Step 6: Final answer
    x = 1,036.33

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.